Tumbler lock



J. B. FREYSINGER.

TUMBLER LOCK- APPLICAIION FILED MAR. 27, 1922- 1,434,947, Patented Nov.7,1922;

attoznuqs reamed Nov. 7, 1922,

, UNITED STATES PATENT wer JOHN B. FREYSINGER, OF STAMFORD, CONNECTICUT,ASSIGNOR TO THE YALE & TO

MANUFACTURING COMPANY,

OF STAMFORD, CONNECTICUT.

TUMBLER LOCK;

, Application .filed March 27, 1922. Serial No. 5i t7,286.'

To all 10 [mm it may concern Be it known that I, JOHN B. Fnnrsmenn,

a citizen of the United States, and a resi able others-.skilled in theart towhich it appertains to make and use the same.

My invention relates to an improvement in tumbler locks, the objectbeing to reinforce the cylinder and plug so as to prevent thepenetration of a cutting or boring tool from the outer side or face ofthe cylinder or plug, sufficiently to engage and destroy or renderinoperative all the tumblers and thus release the plug, and my inventionconsists in a cylinder having a bore for the plug and hardened metalpins secured within the cylinder around the plug sufficiently closetogether to prevent the entrance of a boring tool between them.

It further consists in a cylinder armored as above described incombination with a plug having hardened metal pins arrangedlongitudinally on opposite sides of the key slot so as to prevent accessto the tumblers by boring introduced through the face of the plug.

In the accompanymg drawings, Figure 1 is a view in front elevation of apin tumbler lock embodying my invention; Figure 2 is a rear elevation,the cam or the plug for actuating the-lock mechanism being omitted;Figure 3 is a view in longitudinal section of the cylinder and plugtaken through the hardened pins and Figure dis a view in transversesection.

10 represents the cylinder provided centrally with a bore to receive theplug 11, the latter being held in the cylinder in any approved manner,and provided with a cam or other device, not shown, for actuating themechanism of the lock to which the tumbler lock is applied.

The lock may be of the sliding or pin tumbler type, the latter beingshown, and the tumbler chambers may be of the single or doubleconstruction as preferred topermit of the removal of the key at half,instead of a full revolutioi'i which however is not material so far asmy present invention, is concerned; g p

12 are hardenedsteel pins driven into the cylinder 10 at the rear of thelatter and so disposed and so close to each other as to prevent theentrance of any cutting tool between them. hardenednt their front endsand left soft at their rear ends so that they may v be machined and arelocated. sufficiently close to the. bore in the cylinder, in WhiCllthGplug is mounted to turn to prevent'the entrance of a boring tool betweenthem and the plug 11.

The rear end of the plug 11 is of greater diameter than the front end,hence the rear softer ends of the pins 12 are cut away to conform to thebore in the cylinder to receive the large rear end of the plug.

The pins 12 stop short of the front face of the cylinder which latter ispreferably made of softer and non-corrosive metal, so that they do notshow at the front, but they extend from the rear to the frontsufficiently far toprotect some or all of the tumblers to prevent thedestruction of some of the tumblers which, as is well known, hold theplug against turning movement except whenv actuated by the proper key.

The plug 11 projects through the cylinder thus formed, and it isprotected, by a plurality, preferably four steel pins 13 drivenlengthwise therein from the rear end at opposite sidesof the key slot14, and preferably terminate, though not necessarily so, short of thefront of the face plate of the plug so as not to be exposed in thefront. They extend however in front of some and preferably all of thetumblersso are in position to protect the latter against the attack of aboring tool, and the front ends are hardened and the rear endspreferably left soft to permit them to be se curely fastened within theplug.

In this construction the hardened steel pins surrounding the plug andthe hardened steel pins in the plug, at opposite sides of the key holein the latter, prevent sufficient penetration of a boring tool todestroy or render ineffective the pins or tumblers which as beforeexplained hold the plug against turning movement, except when they areactuated by the proper key.

\ a in ervals n Having fully described my invention what I claim as newand desire to secure by Letters Patent, is

1. A tumbler lock cylinder having a central bore for the plug andprovided with a plurality of hardened steel pins located circular formaround said bore. a v I 1 2. A tumbler lock cylinder having a centralbore for the plug and provided with longitudinally arranged pins locatedat in tervals around the bore, the outer ends of said pins beinghardened and of material harder than the cylinder.

3. A tumbler lock comprising a cylinder and a plug mounted to turn inthe cylinder, the latter being provided with a plurality *of hardenedsteel pins located in'a circle at intervals around the" bore for theplug,

and the latter having a plurality of hardened pins located at oppositesides of the key slot. 4. A tumbler lock compris ng a cylinder and aplug mounted to turn in the cylinder, I i

the former being provided with a plurality of steel pins, harder attheir front ends than at their rear ends and located at in tervalsaroundthe bore of the plug.

5. A tumbler lock comprising a cylinder and a plug mounted to turn inthe cylinder, the said cylinder and plug having a plurality of hardenedsteel pins, the pins in the cylinder surrounding and adjacent the plugand the pins in the plug being at oppositesides of the key slot in thelatter.

6. A tumbler lock comprising a cylinder and a plug mounted to turn inthe cylinder the latter being provided with a :plurality of hardenedsteel pins surrounding the plug and stopping short of the front end ofthe cylinder. y

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses. i y JOHN B. FR EY SINGER. Witnesses: p

1 RED S. LooKWoop, C AS. B RizY.

